EP0839949A1 - Method and arrangement for increasing evaporation capacity of a multi-stage evaporator of spent liquor in a pulp mill - Google Patents
Method and arrangement for increasing evaporation capacity of a multi-stage evaporator of spent liquor in a pulp mill Download PDFInfo
- Publication number
- EP0839949A1 EP0839949A1 EP97660115A EP97660115A EP0839949A1 EP 0839949 A1 EP0839949 A1 EP 0839949A1 EP 97660115 A EP97660115 A EP 97660115A EP 97660115 A EP97660115 A EP 97660115A EP 0839949 A1 EP0839949 A1 EP 0839949A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- evaporation
- vapour
- stage
- spent liquor
- supplied
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/10—Concentrating spent liquor by evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
- B01D1/284—Special features relating to the compressed vapour
- B01D1/2846—The compressed vapour is not directed to the same apparatus from which the vapour was taken off
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S159/00—Concentrating evaporators
- Y10S159/08—Multieffect or multistage
Definitions
- the invention relates to a method for increasing evaporation capacity in a multi-stage evaporation plant of spent liquor in a pulp mill, wherein each evaporation stage may comprise one evaporation unit or a plurality of evaporation units connected in parallel, said method comprising evaporating water from spent liquor in evaporation units belonging to each evaporation stage in such a way that, in each evaporation unit of a stage, the spent liquor separately supplied to said evaporation unit is heated indirectly with vapour which is supplied thereto and the temperature of which exceeds that of the evaporation unit, said spent liquor boiling at a temperature corresponding to a boiling point, whereby vapour is separated therefrom, said vapour having a lower temperature and lower pressure than the vapour supplied to said evaporation unit for heating, the vapour separated in said evaporation unit being supplied to the following evaporation stage for heating the spent liquor supplied thereto.
- the invention further relates to an arrangement for increasing evaporation capacity of a multi-stage evaporation plant of spent liquor in a pulp mill, said evaporation plant comprising a plurality of evaporation stages operating by means of indirect heating, each evaporation stage comprising one evaporation unit or a plurality of evaporation units connected in parallel, conduits for supplying the spent liquor from one evaporation stage to another, and conduits for supplying vapour to the evaporator and correspondingly the vapour separated from the spent liquor in evaporation stages during heating to the following evaporation stage.
- Evaporation of spent liquors in pulp mills has been carried out by multi-stage evaporators operating by means of fresh vapour, spent vapour, vent gas or flash vapour.
- the number of stages refers to how many times the vapour boils the liquid before the last condensation.
- An evaporation unit is usually an apparatus with a separate system of conduits, e.g. heating elements in which vapour supplied to the vapour side condenses and is discharged as condensate. When the vapour condenses, it releases heat, which is conducted through a heat delivery surface to the liquid to be evaporated, which boils at its own boiling temperature, producing vapour.
- One of such evaporation unit types is a so-called falling film evaporator, in which black liquor is supplied in such a way that it flows down on the surface of the heating elements as a thin film, whereby a high heating effect is achieved.
- the purpose of evaporation is to remove water from the liquor that is evaporated in order to concentrate it.
- the operation of a multi-stage evaporation plant which evaporates liquor by fresh vapour or vent gas is based on the fact that energy supplied to the vapour side of the first stage as vapour, vent gas or in some other way boils the liquid on the liquor side, producing thus new vapour the temperature of which is lower than that of the substance producing heat energy, and the vapour thus produced has a lower pressure than the vapour supplied to the vapour side of the heat exchanger.
- the vapour produced is supplied to the vapour side of the following stage, i.e. the second stage. When the vapour condenses, it releases its heat to the liquor on the liquor side. The liquor heats up and boils, producing thus new vapour, the pressure and temperature of which are lower than those of the vapour supplied to this stage.
- the vapour produced is usually condensed with water or air in a condenser.
- the number of stages is limited by the pressure of the vapour that is used, the amount of vapour reserved for evaporation, and the size of the heat delivery surfaces of the units.
- European Patent No. 36 235 discloses an evaporator solution based on the thermo-compressor principle.
- the heating effect of an evaporation unit is increased by compressing vapour separated from the liquor by means of a vapour compressor to a higher pressure, and by recirculating this vapour to the evaporation unit in which it was separated.
- internal vapour circulation is provided in evaporators.
- this principle can also be used by connecting a plurality of evaporation units in series, and by supplying the vapour separated in a stage with a lower pressure and temperature back to an evaporation unit having a higher pressure at the other end of the series after being compressed to a higher pressure by a compressor.
- the drawback of this solution is that, in addition to the necessary compressor, separate expensive evaporation units are required.
- the method of the invention is characterized in that the pressure of the vapour which is discharged from at least one evaporation stage and which has been separated from the spent liquor in said stage is increased by a separate booster means, and that the vapour discharged from said booster means is supplied to the following evaporation stage for heating the spent liquor supplied thereto.
- the arrangement of the invention is characterized in that at least one conduit for supplying the vapour from one evaporation stage onwards is provided with a booster means for increasing the pressure of the vapour before it is supplied to the following stage.
- vapour separated from spent liquor, usually black liquor, in at least one evaporation stage is compressed by a booster means, such as a compressor or a fan, to a higher pressure, whereafter the vapour having the higher pressure is supplied to the following evaporation stage to heat the spent liquor therein.
- a booster means such as a compressor or a fan
- a compressor or fan is used in one or more sections between two successive evaporation stages for compressing vapour separated in a preceding evaporation step, in the direction of vapour flow, to a higher pressure in said one or more sections between two successive evaporation stages, and for supplying it to the following evaporation stage, where the vapour separated from the spent liquor may again, if desired, be compressed to a higher pressure and supplied to the following stage.
- the pressure of the vapour is increased at the incoming end of thin liquor, i.e. at the evaporation stages in which the evaporation temperature is rather low in any case. In this case, a relatively great change can be achieved in the temperature difference.
- An advantage of the invention is that even a small increase in pressure causes a corresponding increase in the temperature difference, whereby the heating effect and thus the evaporation capacity of the evaporation plant increase considerably. Even a small increase in pressure and a corresponding increase in the temperature difference are significant in view of their effect on the evaporation result of the evaporation plant.
- the invention is simple and easy to apply to existing evaporation plants without any expensive construction work and without extra units, since a compressor or fan can be simply and easily provided in a vapour conduit.
- the costs of the invention are only 20% to 30% of the above-mentioned prior art solution in a thermo-compressor evaporation plant.
- the power consumption is lower than in thermo-compressor evaporation plants, since no liquor transfer pumps are needed. Thus, the overall efficiency is much better than in the case of the prior art solutions.
- FIG. 1 is a schematic view of a conventional multi-stage evaporation plant comprising a plurality of separate evaporation stages I-V.
- the evaporation stages I-V are numbered according to the order in which vapour is supplied in series through them.
- the term 'vapour' refers both to normal pure fresh vapour and to the vent gas which is formed from liquor through evaporation and which comprises mainly vapour but also various substances and impurities separated from the liquor during the evaporation.
- the evaporation stages I-V may be any known evaporators in which spent liquor, usually black liquor, is heated indirectly by means of heat delivery surfaces or heating elements in such a way that hot vapour is located on one side and spent liquor on the other side of the heat delivery surface.
- One evaporation stage may comprise one evaporation unit or several evaporation units connected in parallel on the vapour side.
- These structures and solutions are fully known per se, wherefore they will not be described in greater detail herein.
- one evaporation unit represents one evaporation stage, by way of example. When several parallel evaporation units are used, their incoming and outgoing vapour conduits are connected to each other, wherefore they can be regarded operationally as one evaporation stage.
- the spent liquor is supplied at first through conduit 1 to evaporation stage V.
- a circulation conduit 2a extends from the lower end of the evaporation unit of evaporation stage V.
- the spent liquor is recirculated through pump 3a to the upper part of the evaporation unit of evaporation stage V so that it circulates efficiently along the evaporator surfaces.
- conduit 4 through which the concentrated spent liquor is conducted to evaporation stage IV, branches from the circulation conduit.
- Conduit 4 is usually connected to the suction side of pump 3b in the circulation conduit 2b of the spent liquor circulation. From there the spent liquor is arranged to circulate in evaporation stage IV by means of pump 3b.
- conduit 5 branches for conducting the further concentrated spent liquor to the spent liquor circulation 2c of evaporation stage III.
- conduit 6 extends to the spent liquor circulation 2d of evaporation stage II.
- the spent liquor is supplied through conduit 7 to the spent liquor circulation 2e of evaporation stage I, whereby pump 3e circulates the spent liquor in evaporation stage I.
- the spent liquor is supplied through a separate discharge conduit 8 to an expansion tank 9, where its pressure is reduced and water still separates from it as vapour. Thereafter the spent liquor is supplied through conduit 10 in a manner known per se for further treatment or for storage, whereas the vapour is discharged through conduit 11.
- Fresh vapour of a pulp mill is supplied to evaporation stage I through conduit 12, whereby it heats the spent liquor and condenses at the same time.
- Pure fresh vapour condensate is discharged from the lower end of the evaporation unit of evaporation stage I through a separate pure condensate conduit 13.
- Vapour of about 110° to 125°C separates from the spent liquor in evaporation stage I.
- the pressure of the vapour corresponds to its temperature and is over atmospheric pressure.
- the vapour is supplied through conduit 14 to the following evaporation stage II.
- the vapour separated from the spent liquor correspondingly condenses in evaporation stage II and is discharged through conduit 15.
- vapour is supplied through conduit 18 to the following evaporation stage IV, in which it once again heats the spent liquor. While releasing heat, the vapour condenses and is discharged as condensate through conduit 19.
- Vapour separated from the spent liquor in evaporation stage V is supplied through conduit 22 to a surface condenser 23, from which the condensate that is formed is discharged through conduit 24.
- the gases that are formed during evaporation of the liquor and that are not condensed but accumulate in the surface condenser are sucked from the surface condenser by a separate underpressure generation means 25 so that the evaporation is not disturbed.
- FIG. 2 is a schematic view of a multi-stage evaporation plant of Figure 1 in which an embodiment of the invention is applied.
- the pressure of the vapour conducted from one evaporation stage to another can be increased after one or more evaporation stages by one or more booster means, such as individual fans or compressors or groups of fans or compressors, mounted in conduits 14, 16, 18 or 20 for the evaporated vapour at points A to D.
- booster means such as individual fans or compressors or groups of fans or compressors
- the temperature increase is 3° to 10°C, with a group of fans it is 8° to 20°C, and when compressors are used, it is even greater.
- the effect of the temperature increase on the evaporation capacity is up to 50 tn/h.
- a compressor or fan is preferably provided at points B and C, but if desired, even at points A and D, indicated with broken lines. Furthermore, the temperature of the vapour discharged from evaporation stage V may be increased by fan E, indicated in the figure with broken lines. In this case, less cooling water is required for the surface condenser, or the temperature of warm water or other substance to be heated is increased, and/or unit V is allowed to operate at a lower pressure and temperature.
- FIG 3 is a schematic view of a solution which operationally corresponds to the one of Figure 2 and in which the flow of fresh vapour, of vapour between the different evaporation stages, and of condensate formed from the vapour is as illustrated in Figure 1.
- the flow of the spent liquor to be evaporated differs from Figure 1 in such a way that, before being supplied to stage II, the spent liquor to be evaporated is supplied through conduit 1 to evaporation stage III, where it is circulated by a circulation pump 3c along circulation conduit 2c, and vapour is formed from the spent liquor, as illustrated in Figure 1.
- the concentrated spent liquor is supplied through conduit 6 to evaporation stage IV, where vapour separates from the spent liquor.
- evaporation stage IV From evaporation stage IV the further concentrated spent liquor is supplied through conduit 5 to evaporation stage V, where vapour separates from the spent liquor, as in the preceding evaporation stages.
- the spent liquor concentrated in evaporation stage V is supplied through conduit 4 to a tank 26, from which it is further supplied through conduit 27 to conduit 2d of evaporation stage II, where its treatment continues as illustrated in Figure 1.
- booster means such as fans, fan groups or compressors, can be mounted at points A to E even in the embodiment shown in Figure 3, depending on the situation, as described in connection with Figure 2.
- the best efficiency is achieved if they are used at the end of the evaporation plant, e.g. after stage II and/or III, where the temperatures and pressures are the most suitable and can thus be more easily increased.
- each evaporation stage may also comprise several units, in which case they are connected in parallel on the vapour sides. Most usually, evaporation stage I is divided into several units for example for process-technical reasons or because of washing requirements.
- Figure 4 is a schematical view of an embodiment of the invention in which the first stage consists of two units connected in parallel. This embodiment corresponds to the arrangements illustrated in Figures 1 and 2 except for the flows at the first unit: the first stage comprises two units, i.e. IA and IB, instead of one unit.
- the liquor is supplied to evaporation stage V of the evaporation plant through conduit 1.
- Water is still separated from the spent liquor as vapour, whereafter the spent liquor is supplied through conduit 10 in a manner known per se for further treatment or to a storage tank, and the vapour discharged from the expansion tank is usually supplied either to a separate condenser or to a vapour conduit or unit having a suitable pressure, where it is condensed.
- Fresh vapour of a pulp mill is supplied for evaporation through conduits 12 both to unit IA and to unit IB in evaporation stage I.
- vapour condenses in units IA and IB it heats the spent liquor, whereby vapour is formed from the liquor in these units and supplied through conduits 14 to unit II of evaporation stage II.
- the condensate condensed from fresh vapour in units IA and IB is supplied from the units through condensate conduits 13 and discharged from the evaporation plant.
- the invention is described merely by way of example, and it is by no means restricted to this example.
- the essential feature of the invention is that in a certain evaporation stage, the pressure, and thus even the temperature, of the vapour separated from the spent liquor are increased by a booster means, fan or compressor, and this vapour is supplied to the following evaporation stage to indirectly heat the spent liquor therein, whereby the evaporation capacity of the evaporation plant increases.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Paper (AREA)
Abstract
Description
Claims (14)
- A method for increasing evaporation capacity in a multi-stage evaporation plant of spent liquor in a pulp mill, wherein each evaporation stage may comprise one evaporation unit or a plurality of evaporation units connected in parallel, said method comprising evaporating water from spent liquor in evaporation units belonging to each evaporation stage in such a way that, in each evaporation unit of a stage, the spent liquor separately supplied to said evaporation unit is heated indirectly with vapour which is supplied thereto and the temperature of which exceeds that of the evaporation unit, said spent liquor boiling at a temperature corresponding to a boiling point, whereby vapour is separated therefrom, said vapour having a lower temperature and lower pressure than the vapour supplied to said evaporation unit for heating, the vapour separated in said evaporation unit being supplied to the following evaporation stage for heating the spent liquor supplied thereto, characterized in that the pressure of the vapour which is discharged from at least one evaporation stage and which has been separated from the spent liquor in said stage is increased by a separate booster means, and that the vapour discharged from said booster means is supplied to the following evaporation stage for heating the spent liquor supplied thereto.
- A method according to claim 1, characterized in that the pressure of the vapour discharged from at least two evaporation stages is increased by separate booster means.
- A method according to claim 1 or 2, characterized in that the pressure is increased at the end of the evaporation plant.
- A method according to any one of claims 1 to 3, characterized in that the pressure of the vapour is increased by a fan.
- A method according to any one of claims 1 to 3, characterized in that the pressure of the vapour is increased by a compressor.
- A method according to claim 4, characterized in that the pressure of the vapour is increased by a group of fans.
- A method according to claim 5, characterized in that the pressure of the vapour is increased by a group of compressors.
- An arrangement for increasing evaporation capacity of a multi-stage evaporation plant of spent liquor in a pulp mill, said evaporation plant comprising a plurality of evaporation stages (I-V) operating by means of indirect heating, each evaporation stage comprising one evaporation unit or a plurality of evaporation units connected in parallel, conduits (1-8, 26) for supplying the spent liquor from one evaporation stage (I-V) to another, and conduits (12, 14, 16, 18, 20, 22) for supplying vapour to the evaporator and correspondingly the vapour separated from the spent liquor in evaporation stages (I-V) during heating to the following evaporation stage (I-V), characterized in that at least one conduit (14, 16, 18, 20, 22) for supplying the vapour from one evaporation stage (I-V) onwards is provided with a booster means (A-E) for increasing the pressure of the vapour before it is supplied to the following stage.
- An arrangement according to claim 8, characterized in that it comprises a booster means mounted in at least two conduits (14, 16, 18, 20, 22) for supplying vapour from one evaporation stage (I-V) onwards.
- An arrangement according to claim 8 or 9, characterized in that the booster means are provided at the end of the evaporation plant.
- An arrangement according to any one of claims 8 to 10, characterized in that at least one booster means is a compressor.
- An arrangement according to any one of claims 8 to 10, characterized in that at least one booster means is a fan.
- An arrangement according to claim 11, characterized in that the booster means consists of a group of compressors.
- An arrangement according to claim 12, characterized in that the booster means consists of a group of fans.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI964415A FI118131B (en) | 1996-11-01 | 1996-11-01 | Process and arrangement for increasing the evaporation capacity of the residual liquor in a multi-evaporation cellulosic plant consisting of several evaporation stages |
FI964415 | 1996-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0839949A1 true EP0839949A1 (en) | 1998-05-06 |
Family
ID=8546993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97660115A Ceased EP0839949A1 (en) | 1996-11-01 | 1997-10-30 | Method and arrangement for increasing evaporation capacity of a multi-stage evaporator of spent liquor in a pulp mill |
Country Status (3)
Country | Link |
---|---|
US (1) | US6132555A (en) |
EP (1) | EP0839949A1 (en) |
FI (1) | FI118131B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6761799B2 (en) | 2000-03-24 | 2004-07-13 | Andritz Oy | Method and arrangement for combusting black liquor |
WO2005056152A1 (en) * | 2003-12-11 | 2005-06-23 | Gea Wiegand Gmbh | Evaporation system |
WO2009053518A2 (en) * | 2007-10-26 | 2009-04-30 | Andritz Oy | Arrangement for evaporating liquids |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AP2302A (en) | 2005-03-07 | 2011-10-31 | Ide Technologies Ltd | Multi-effect evaporator. |
US20070131363A1 (en) * | 2005-10-24 | 2007-06-14 | Andritz Inc. | Fiberline systems, processes and methods |
FI121566B (en) * | 2009-11-24 | 2011-01-14 | St1 Biofuels Oy | Apparatus for recovery of organic compounds and drying of organic pulp |
RU2455673C1 (en) * | 2010-12-23 | 2012-07-10 | Закрытое акционерное общество Научно-производственное предприятие "Машпром" (ЗАО НПП "Машпром") | Method of control of multiple-effect evaporator with natural circulation head evaporator |
DE102011108211A1 (en) * | 2011-07-21 | 2013-01-24 | Thyssenkrupp Uhde Gmbh | A process for concentrating aqueous liquor and apparatus therefor |
US9249081B2 (en) | 2011-12-16 | 2016-02-02 | Celanese International Corporation | Processes for the production of acrylic acids and acrylates |
US8709204B1 (en) * | 2013-03-14 | 2014-04-29 | Veolia Water Solutions & Technologies North America Inc. | System and process for recovering heat from weak black liquor in a wood pulping process |
CA2915819A1 (en) * | 2013-06-18 | 2014-12-24 | R3 Fusion, Inc. | Controlled thin film vapor generator for liquid volume reduction |
US9925476B2 (en) * | 2016-03-28 | 2018-03-27 | Energy Integration, Inc. | Energy-efficient systems including combined heat and power and mechanical vapor compression for biofuel or biochemical plants |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4284480A (en) * | 1978-10-18 | 1981-08-18 | Bbc Brown, Boveri & Company Limited | Method for the concentration of solutions |
EP0036235A1 (en) * | 1980-03-17 | 1981-09-23 | Stork Friesland B.V. | Method and plant for the evaporation of a liquid solution thereby using mechanical compression |
EP0068996A1 (en) * | 1981-06-26 | 1983-01-05 | Laguilharre S.A. | Steam pressure liquid product evaporation-concentration plants, such as for a dairy product |
EP0188019A1 (en) * | 1984-12-14 | 1986-07-23 | Metallgesellschaft Ag | Method of cleaning vapour condensate |
WO1996012848A1 (en) * | 1994-10-20 | 1996-05-02 | Kvaerner Pulping Ab | Process for the final evaporation of black liquor |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL279567A (en) * | 1962-06-12 | |||
US3951753A (en) * | 1969-06-03 | 1976-04-20 | Roller Paul S | Method and apparatus for the conversion of an aqueous scale-formed liquid |
US3763020A (en) * | 1971-02-11 | 1973-10-02 | Envirotech Corp | Terpene recovery by multi effect evaporation with vent vapor compression |
DE3016406C2 (en) * | 1980-04-29 | 1985-11-28 | Fried. Krupp Gmbh, 4300 Essen | Multi-stage thermal material separation process with a combined vapor compressor and heat transformer to recover the heat contained in the vapors and a device for carrying out the process |
JPS5784701A (en) * | 1980-11-18 | 1982-05-27 | Sumitomo Heavy Ind Ltd | Method for concentrating fermented liquor and separating alcohol by evaporation |
US5139620A (en) * | 1990-08-13 | 1992-08-18 | Kamyr, Inc. | Dimple plate horizontal evaporator effects and method of use |
JPH08501605A (en) * | 1992-05-29 | 1996-02-20 | クワエネル パルピング テクノロイース アーベー | Energy recovery method from combustible gas |
-
1996
- 1996-11-01 FI FI964415A patent/FI118131B/en not_active IP Right Cessation
-
1997
- 1997-10-30 EP EP97660115A patent/EP0839949A1/en not_active Ceased
- 1997-10-30 US US08/961,180 patent/US6132555A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4284480A (en) * | 1978-10-18 | 1981-08-18 | Bbc Brown, Boveri & Company Limited | Method for the concentration of solutions |
EP0036235A1 (en) * | 1980-03-17 | 1981-09-23 | Stork Friesland B.V. | Method and plant for the evaporation of a liquid solution thereby using mechanical compression |
EP0068996A1 (en) * | 1981-06-26 | 1983-01-05 | Laguilharre S.A. | Steam pressure liquid product evaporation-concentration plants, such as for a dairy product |
EP0188019A1 (en) * | 1984-12-14 | 1986-07-23 | Metallgesellschaft Ag | Method of cleaning vapour condensate |
WO1996012848A1 (en) * | 1994-10-20 | 1996-05-02 | Kvaerner Pulping Ab | Process for the final evaporation of black liquor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6761799B2 (en) | 2000-03-24 | 2004-07-13 | Andritz Oy | Method and arrangement for combusting black liquor |
WO2005056152A1 (en) * | 2003-12-11 | 2005-06-23 | Gea Wiegand Gmbh | Evaporation system |
WO2009053518A2 (en) * | 2007-10-26 | 2009-04-30 | Andritz Oy | Arrangement for evaporating liquids |
WO2009053518A3 (en) * | 2007-10-26 | 2009-06-04 | Andritz Oy | Arrangement for evaporating liquids |
Also Published As
Publication number | Publication date |
---|---|
FI964415A0 (en) | 1996-11-01 |
US6132555A (en) | 2000-10-17 |
FI964415A (en) | 1998-05-02 |
FI118131B (en) | 2007-07-13 |
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